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Multiferroics: Materials and Application

发布时间: 2014-04-21 14:25 | 【 【打印】【关闭】

  SEMINAR
  The State Key Lab of
  High Performance Ceramics and Superfine Microstructure
  Shanghai Institute of Ceramics, Chinese Academy of Sciences
  中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室

  1. Multiferroics: Materials and Application

  Speaker:Prof. Z. X. Cheng

  Institute for Superconducting & Electronic Materials (ISEM), University of Wollongong, Australia 

  2. BZT-BCT压电薄膜纳米力学性能与摩擦学行为研究

  Speaker:王增梅 教授

  东南大学 材料科学与工程学院

  时间:4月22日 (星期二)下午3:30

  地点:2号楼607会议室

  联系人:赵洪阳 

  Abstract

  Multiferroic material is a class of materials containing more than one ferroic order. Ferroelectric magnetic multiferroic materials contain simultaneous polarization and magnetization. The separated ferroic orders and the coupling between them make the multiferroic material the great potential for application in memory devices and sensors. I will talk about our work on novel multiferroic and magnetoelectric systems, which include novel multiferroic material fabrication and modification, and multiferroicism in strained thin films, magnetoelectric coupling, exchange bias in multiferroic heterostructures and single phases, spin dynamics study using ultrafast laser spectra, and some work on multiferroic orthoferroic system using inelastic neutron scattering and THz.

  摘 要

  本课题主要研究钙钛矿结构BZT-0.5BCT压电薄膜相变过程中伴随的纳米力学性能变化,以及压电性对薄膜摩擦学行为的影响。实验中,采用溶胶-凝胶法制备出BZT-0.5BCT压电薄膜,利用纳米压痕仪(Micro Systems)原位观察不同温度下薄膜的弹性模量、硬度;利用侧向力显微镜(LFM)观察薄膜的摩擦学行为。结果表明,钙钛矿结构BZT-BCT薄膜在温度变化下发生相变,薄膜的纳米力学性能也会发生相应的变化,结合薄膜的热膨胀曲线分析发现这种变化与体系所处的晶体结构有密切的联系; 在薄膜的摩擦学行为研究中发现薄膜的压电性对摩擦过程中产生的黏附力和摩擦力都有很大的影响,与表面电子的电子结构以及电子云之间的作用力有关,更多关于这方面的内容仍在做大量的研究。